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Electronic Resource

Thermal behavior of new polymer electrolytes (1995)

Fauteux, D. ; McCabe, P.

New York, NY : Wiley-Blackwell

Polymers for Advanced Technologies 6 (1995), S. 83-90

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ISSN: 1042-7147

Keywords: polymer electrolytes ; salt ; phase diagram ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Solid polymer electrolytes (SPE) have been identified as a class of materials which could enable the fabrication of high energy density solid state lithium rechargeable batteries which could meet the performance requirements for advanced portable electronic and automotive applications. In order to achieve this goal, novel SPE systems having high ionic conductivity and good mechanical properties at or near ambient temperature must be developed. Novel lithium salts believed to be useful in realizing this objective have recently been proposed. The thermal behavior of SPE systems based on high molecular weight poly(ethylene oxide) (PEO) and on two novel salts, the lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and the lithium tris(trifluoromethylsulfonyl)-methanide (LiTSFM) is reported and compared with the thermal behavior of the high molecular weight PEO-lithium trifluoromethane sulfonate (LiTFLT) SPE system. Phase diagrams for the PEO-LiTFSI and PEO-LiTFSM SPE systems have been established and are discussed in terms of their impact on SPE-based rechargeable lithium battery technologies. The use of a novel plasticizer in conjunction with the PEO-LiTFSI-based SPE system is reported and it is shown how this modifies the thermal behavior of the PEO-LiTFSI SPE system.

Additional Material: 8 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pat.1995.220060205

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New signal processing techniques for improved precision of noninvasive impedance cardiography (1989)

Nagel, J. H. ; Shyu, L. Y. ; Reddy, S. P. ; [et al.]

Springer

Annals of biomedical engineering 17 (1989), S. 517-534

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ISSN: 1573-9686

Keywords: Impedance cardiography ; Pattern recognition ; Signal processing ; Matched filter ; Cardiac output

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine , Technology

Notes: Abstract Impedance cardiographic determination of clinically important cardiac parameters such as systolic time intervals, stroke volume, and related cardiovascular parameters has not yet found adequate application in clinical practice, since its theoretical basis remains controversial, and the precision of beat-to-beat parameter estimation has until recently suffered under severe shortcomings of available signal processing techniques. High levels of noise and motion artifacts deteriorate signal quality and result in poor event detection. To improve the precision of impedance cardiography, new techniques for event detection and parameter estimation have been developed. Specifically, matched filtering and various signal segmentation and decomposition techniques have been tested on impedance signals with various levels of artificially superimposed noise and on actual recordings from subjects in a laboratory study of cardiovascular response to a cognitive challenge. Substantial improvement in the precision of impedance cardiography was obtained using the newly developed signal processing techniques. In addition, some preliminary evidence from comparisons of the impedance cardiogram with invasive aortic electromagnetic flow measurement in anesthetized rabbits is presented to address questions relating to the origin of the impedance signal.